<!DOCTYPE html>
<html>
<head>
<style>
span {
    font-size: 300%;
}
</style>
</head>
<body>
<div id="textbox" contenteditable="true">
<img id="purpleimage" style="inline-size:20px;block-size:100px;background-color:purple">
</div>

</body>
</html>
